No sound， when vedio is played in faster or slower speed.

[vectorstudio]

I am facing a problem.when I change the vedio speed,if speed higher than 1.2 or slower than 0.88, no sound.

I tried in RaspberryPI zero. I forced audio output from HDMI(raspi-config)

sudo omxplayer -o hdmi /mnt/disk/movie.mp4
using keyborad to change speed. or using omxplayer_wrapper set_rate() to change speed.

Please help，thanks.

infomation about oxmplayer installed ：
pi@raspberrypi:~ $ sudo apt-cache show omxplayer
Package: omxplayer
Version: 20190723+gitf543a0d-1
Architecture: armhf
Maintainer: Serge Schneider serge@raspberrypi.org
Installed-Size: 618
Depends: libasound2 (>= 1.0.16), libavcodec58 (>= 7:4.0), libavformat58 (>= 7:4.1), libavutil56 (>= 7:4.0), libc6 (>= 2.28),
libdbus-1-3 (>= 1.9.14), libfreetype6 (>= 2.2.1), libgcc1 (>= 1:3.5), libpcre3, libstdc++6 (>= 5.2), libswresample3 (>= 7:4.0), zlib1g (>= 1:1.1.4), ca-certificates, dbus